Countersurveillance refers to measures that are taken to prevent surveillance of an entity(s), including covert surveillance.
Countersurveillance may include electronic methods such as technical surveillance counter-measures, which is the process of detecting surveillance devices. It can also include covert listening devices, visual surveillance devices, and countersurveillance software, to thwart activities such as accessing people or computers or networks or mobile devices.
More often than not, countersurveillance will employ a set of actions (countermeasures) that, when enacted, prevent or reduce the risk of surveillance.
Countermeasures used to prevent or reduce access, fall specifically within four defined categories:
- Electronic countermeasures
- Human countermeasures
- Software countermeasures
- Structural countermeasures
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